38405663 has 4 divisors (see below), whose sum is σ = 38698968. Its totient is φ = 38112360.

The previous prime is 38405651. The next prime is 38405671. The reversal of 38405663 is 36650483.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 38405663 - 2¹⁴ = 38389279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38405863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146456 + ... + 146717.

It is an arithmetic number, because the mean of its divisors is an integer number (9674742).

Almost surely, 2^38405663 is an apocalyptic number.

38405663 is a deficient number, since it is larger than the sum of its proper divisors (293305).

38405663 is a wasteful number, since it uses less digits than its factorization.

38405663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293304.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 38405663 is about 6197.2302684344. The cubic root of 38405663 is about 337.3896498860.

The spelling of 38405663 in words is "thirty-eight million, four hundred five thousand, six hundred sixty-three".